Improvement in devices for black-washing molds



UNITED STATES.

PATENT QFFIGE JOHN W. HARRISON, OF ST. LOUIS, MISSOURI.

I IMPROVEMENT IN DEVICES FOR BLACK-WASHING MOLDS.

Specification forming part of Letters Patent- No. 156,999, dated November 17, 1874; application filed August 19, 1874.

To all whom it may concern:

Be it known that I, JOHN W. HARRISON, of St. Louis, in the county of St. Louis and State of Missouri, have invented an Improvement in Black-\Vashing Pipe-Molds, of which smaller diameter by the use of a block of wood, a disk, or other material inserted into the mold, and thereby restraining the flow of the black-wash temporarily until sufficient can be poured in to accomplish the purpose, and dropping said devices through the mold, or withdrawing said devices out from the top, causing the black-wash to flow down the sides.

The difficulties attending the use of these methods and devices of a similar nature have been the unequal flow of the black-wash over the surface of the mold, leaving streaks and parts not coated at all; especiallyin the cases where the black-wash was temporarily arrested, the sedimentary part of the blackwash, by-its gravity, created ridges or tears in the surfaces of the mold, thus destroying the usefulness or value of the casting when made; also, since the use of flasks for molding pipes, adjusted so as to avoid placing them upon a ramming-stand, by inserting the conical end of the pattern into the same form as is used in holding the core in position, the lowering of the block of wood or brush through the mold is rendered impossible without removing the bottom or lower section of the mold, which the late improvements in molding pipe were especially designed to avoid.

My invention obviates all these difficulties, and consists in the use of a device, as will hereinafter appear, for causing a stream or volume of coating or black-wash to have a spiral flow, and producing a cone-shaped dis charge, to come in contact with every part of the mold.

Of the drawing, Figure 1 is a sectional elevation of a pipe-mold, showing my device in same. Fig. 2 is a perspective view, illustrating my improved device.

A is the pipe-mold. The bell end or top opening of the pipe A Iv provide with a funnel, B.

In Fig. 2 I show the funnel B provided with one or more spiral blades, 1). This blade can further be provided, if desired, with a vertical blade, I), so as to form a duct or chute, in which the black-wash can be simply poured; and said black-wash, by virtue of said blades 1) b, is caused to assume the spiral flow, and to produce a cone-shaped discharge out of funnel, as above stated.

The flow, motion, or action of the blackwash in my core is therefore adequate, free, and decisive, especially is of such a nature as not to permit the heavier ingredients or sedimentary parts of the black-wash from being temporarily arrested, and which produces the effect of tears, and consequently injures the casting.

What I claim is A funnel, B, with the spiral blades 1) b, for the purpose of imparting a spiral flow to the black-wash, in the manner herein shown and described.

In testimony of said invention I have hereunto set my hand. 

